I just actually looked at the equipment in the pdf.
I don't want to be brutal.
Well. Upping to 48v is out the window then.
Inductance could possibly be playing a part in it.
Personally I'd start by scrapping the drivers and replacing them with DM860. Budget end ones on offer in the link. Good enough:
Set at 4A.
https://www.omc-stepperonline.com/di...per-motor.html
Then carry on with the bench testing to get familiar with the systems.
When you're ready to install it all (and can afford it again). Power all 3 with a single 60v 600w to 720w supply!.
This higher voltage will overcome the 6.8mh inductance on the motors and should give you a decent velocity.
36V will be very poor when you come to running properly.
If the machine is noisy and you get resonance, that will be down to the inductance. (on 60v they might be ok though).
So if by then you can afford it. Replace motors with:
https://www.omc-stepperonline.com/ne...m-4-wires.html
Or
https://www.omc-stepperonline.com/ne...s39-4204d.html
That's about the jist of it.
I have 4nm steppers with 3mh inductance. Running off DM860A drivers. Powered with 60V.
They're great.